Thomas Bourne, a bystander who broke up the fight, said the victim had initially got the better of his attacker during the fight.

"The bitee actually got the better of him in the fist fight. After we broke them up is when he disclosed he'd been bitten in the testicles," Mr Bourne said.

Anne Arundel County Chief of Police Timothy Altomare called the charges "disturbing" and said his officers should conduct themselves in a professional manner on and off-duty.

"We will cooperate fully with the Baltimore Police Department as they conduct their investigation. At this time, we cannot comment further because for our agency, this is a confidential personnel matter."

Mr Flaig is currently on paid administrative leave following his charges of second-degree assault and public intoxication.